from django.db import models  
from django.utils import timezone  
from django.contrib.auth.models import User  
from django.urls import reverse
from taggit.managers import TaggableManager

class PublishedManager(models.Manager):
    def get_queryset(self):
        return super(PublishedManager,self).get_queryset().filter(status='published')


class Post(models.Model):  
    objects = models.Manager()
    published = PublishedManager()
     #增加标签字段
    tags = TaggableManager()
    
    STATUS_CHOICES = (  
        ('draft', 'Draft'),  
        ('published', 'Published'),  
    )  
  
    title = models.CharField(max_length=250)  
    body = models.TextField()  
    slug = models.SlugField(max_length=250, unique_for_date='publish')  
    author = models.ForeignKey(User, on_delete=models.CASCADE, related_name='author')
    publish = models.DateTimeField(default=timezone.now)  
    created = models.DateTimeField(auto_now_add=True)  
    updated = models.DateTimeField(auto_now=True)  
    status = models.CharField(max_length=10, choices=STATUS_CHOICES, default='draft')  
  
    class Meta:  
        ordering = ('-publish',)  
  
    def __str__(self):  
        return self.title
    
    def get_absolute_url(self):
        return reverse('blog:post_detail',args=[self.publish.year,
        self.publish.month,self.publish.day,self.slug])

class Comment(models.Model):
    #访问评论关联
    post = models.ForeignKey(Post,
                    on_delete = models.CASCADE,
                    related_name='comments')
    name = models.CharField(max_length=80)
    email = models.EmailField()
    body = models.TextField()
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
    active = models.BooleanField(default=True)
    #排序
    class Meta:
        ordering = ('created',)


    def __str__(self):
        return f"Comment by {self.name} on {self.post}"